Xmagnetic  rsvet-holder



PATENTED OUT. 3, 1905.

H. B. DOUGLAS. MAGNETIC RIVBT HOLDER.

PPLIGATION PILED DEO. 2. 1904.

6 SHEETS-SHEET l $55.190 @gica/' PATBNTED 00T. s, 1905. H. B. D0U0LAS.

MAGNETIC RIVET HOLDER.

APPLOATION FILED 1336.2, 1904.

6 SHEETS-'SHEET 2.

PATENTED OCT. 3, 1905. H. B.A DOUGLAS.

IC RIVBT HULDER.

TIoN FILED DB0. 2, 1904.

' MAGNET IGA APPL

6 SHEETS-SHEET 3.

, WJTNESSES.-

PATENTED 0013. 3, 1005.

H. B. DOUGLAS. MAGNETIC RIVETv HOLDER.

AI'E'LIOATION FILED DB0. 2, 1904. l

' SHEETS-SHEET 4 Snowdon www .i

PATENTED OCT. 3 1905.

- H. B. DOUGLAS. I MAGNETIC RIVET HOLDER.

APPLICATION FILE? DEO. 2, 1904.

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l PATENTBD 00T. 3, 1905. H. B.- DOUGLAS. MAGNETIC RIVBT HoLmJR.4

APPLICATION FILED DEG. 2, 1904.

@SHEETS-SHEET e4 y UNITED STATES PATENT OFFICE.,

HENDERSON B. DOUGLAS, O EBUTLER, PENNSYLVANIA, ASSIGNOR OF- ONE-HALF To JOHN s. DOUGLAS, OF BUTLER, PENNSYLVANIA.

MAGNETIC BNET-HOLDER.-

Specification of Letters Patent.

- Patented et. 3, .1905.

Be it known that I, HENDERSON-BDOUGLAS, a citizen of the United States, residing at Butler, in the county of Butler, Statefof Pennsylvania, have invented certain new and useful Improvements in Magnetic Rivet-Holders, of whichthe following 'is a-description, ret'f erence being had to the accompanyingv draw` ings and to the numerals of reference marked thereon. -'Th`1s invention relates to devices of that general .class employed for'hold-ing or bucking up lrivets during-the upsetting or heading operation, and relates principally to imltion to the holding-magnets, whether'the lat. 30.

p'rovements in holding-tools which are held in place by. electromagnets.

ln electromagnetic holders as heretofore constructed the holding set ordie has'u'sually been formed of vsteel or similar paramagnetic material which isattracted to and lirmly holds the rivet-head,' so that when the opposite end .I of the rivet is being headed the hammer-blows jarring and 'displacing momentarily the rivetter be'permanent or energized by an electric current.

j -One object of lthe presentinvention is to.

- providearset or die of amore or less diamag- I. .netc material which will not attract the rivet the hammer-blow.

A further object of the invention is to provide means whereby th sets or dies may be readily adjusted :with re ation to the ma nets other purposes. A -still further Vobject provide an electromagnetic holder` in which the full strength'o. .the magnet may' be: utilized in holding the tool .to its work.

A' still further object of the invention is to provide a tool of this class on which a yieldable cushion orspring is interposed between the Set or die and the electromagnetic holder. f With these and other objects in view, as will appear whenv the invention is .morefnlly disclosed, the invention consists in-the novel construction and arrangement of parts hereinafter described, illustrated in the accomtrating a modified construction. Fig. 3 is 'a sectional view of another modified form, showyiary magnet. jFig.r-4'is a view of afurther modificationy illustrating the employment of a horseshoe-magnet.

same orof different sizes. tional elevation illustrating a further modifi-. 4'cation providing for more accurate adjustnient of the s et or die with elation to the to an extent suiiicient to withdrawit under.

to suit 'rivet-heads of diderent size an for' ofthe invention is to panying drawings, and more particularly pointed out in the appended claims.

In the accompanying drawings, Figure l is Y a longitudinal y sectional elevation of a rivet. set orA holder constructed. in accordance w1th the invention. Fig. 2- is a similar view illusing a set or die adjustingdevice which may be quickly .adjusted by, hand or. by 'an auxil- ]E1`ig.'5 is a.l still further modification showing an iron-clad magnet.

Fig. Gis a-'view illustrating a' horseshoe-mag'-l net holder provided with a .convenient-formof handle. Fig. 7 Ais a sectional view fa further modification of the invention, showing the application of a single magnetic holder lto a number of sets or. dies whic maybe o f-'the ig. 8 is asecholder to meet varying condi ions. Fig. 9 is a transverse sectional eleva-tion of the same on tion ofthe invention. Fig. 12 is-a'sectional elevation illustrating a still further,` modification.

l' Similar numerals erf-reference indicate corresponding parts throughout theseveral iigures ofthe drawings.

tIn Fig. 1 the spool 15 is liangedat both ends; and receives a winding 16 of insulated vWire of any desired diameter, the coil being connected in .any suitable' manner to a source of electrical energy, and a switch of anydesired eharacterfbeing employed in the manner well known .in this art. At one end of the spool is a cup shaped pole-piece 17, preferably formed of soft iron and Aheld in place by a. soft'iron cylindrical casing 18. In the'cup'- shaped pole-piece is arranged a' preferably cylindrical block 20, having a rearwardly-eir- Y tendedv shank 21, that extends through the' spool and-at its rear end has a'redu'ced screw-e threaded portion- 22 passing through a. .threadfe-i To-fthe' 1 05 ed opening in a soft-iron' disk 23. l.

rear end ofthe threaded portion is secured a handle 24, by whichthe tool may bemanipulated, the handle further serving as a meansy 8o I' the line.9 9 'of Fig.'8. Fig. 10 is asimilar IOl for turning the shank'and adjusting the diskA 1n` toward and from the end off the spool, order to prevent independent rotative movement of the disk, the casing `is provided with one'or more projecting pins 25, that arel received within' openings in said disk. The for.-

Ward face ofthe block 2() is recessed for the reception of ,a set or die 27, that is normally projected by' a helical compression-spring 28,' excessive butward movement of, the die being Iprevented vby a pin or screw 4 28 fitting `in a slot in one side of the'die.4 Theface of the die or set is recessed to receive the head of the rivet, and sets or dies having recesses of dii.- ferent sizes may be substituted therefor, as circumstances require. In ordinary devices of this elass'the dies'a-re Vformed of steel or -other material of a paramagnetic nature, which become magnets'when the current is sentthrough the coil. When the hammerblow occurs, thehol'd ing-magnet is often driven away from the metal, and in so doing carries with it the die, and as, the latter is attracted lto the rivet said rivet is partly'withdrawn and the upsetting operationv is interferedl `with. In Vcarrying out the present'invention the die is formedv of some material of a diamagnetic ory approximatelyv diamagnetic nature, Hadields manganesesteel being used-in some cases, or a steel hiwing a percentage of alu-4 minium to olset or partly neutralize the-eect of the "current'fon the paramag'netic metal. This is of importance in that the die when moved back will 'not carry therivet with it.- A further advantage gained is that the spring will take up' the concussion and will permit the holder to move back without separating the die from 'the rivet. j

u InJigL 2 is illustratedaform of tool in which th'e die is formed integral with the block 20',

but the' block and its shank in this instance are formed of a-material nommagnetic or approximately so in its nature.

` Inathe constructions shown in both Figs. 1 and 2 the disk 23 is attracted by the electromagnet' and serves to'force the die more frml y against the rivet-heard l' In E'g. 3 j s illustrated a construction' in 1.5, that is munted on a soft-iron casing 1'8.

a bai of approximately non-magnetic metal, and its rear end is tapered orinclined to recelve the correspondinglyshaped face of an adjusting-key that passes through an openingin the casing 18.- r1`he outer end of the adjusting-key has an opening for the passage of anadjusting-lever 31 that is pivoted at one'V end toa lug or bracket 32 on the exterior of the casing. The opposite end of the lever terminates in a handleg33 that is adjacent to the main carrying-handle, and said lever is normally held outward from the main handle i by means of a coiled compression-spring 34.

the spring in this case being- .dispensed with;4

which the winding 16 is arranged on a spool- To adjust the-die closer to the Work it is merely `necessary .to draw thelever down and thus force the key inward. This adjustment may also be accomplished by an auxiliarymagnet or solenoid instead of by hand,

` lIn Fig. 4 is illustrated a further modiiication embodying substantially the features shown in Fig. 2, save that the electromagnet 16" is of the horseshoe-type.

Fig. 5 illustrates a further modiiication. In

this case the electromagne't 16 is of the ironclad type, having an external casing 37, which attracts the disk 23 and serves to hold the die or set firmly to the rivet. or set in this case is preferably of approxi mately nonfmagnetic material, it may in some instances be formed of iron and act as the movable core of a solenoid.

Fig. 6 shows a further modification in which the electromagnetA is of the horseshoe type. The two-pole pieces of the electromagnet are united by a cross-bar 40, that is preferably V formed integral with a handle 41, of a type novlv used-on pneumatic hammers and similar too s. the rear or shank end ofthe die, and'in said cross-'bar is arranged a slidable wedge 42, bearing against and-sewing las a means for adjusting the die. The handle is hollow and 'forms the spool of a solenoid having'a winding 44. 'In this. spoolis a movable core 45,

connected'by a wire or cord 46 to the wedge 42. When the winding is energized, the core is-moved in the direction of vits length, and lslhe [vedge moves the diecloser to the rivet'- Fig. 7 illustratesia. further modification in whichthe magnetic holder is I-shaped in general contour, the central portion,- receiving the woundspool 15. At one end of the die the double-'ended polefpiece 49 is recessed at 'to receive a rivet-head. At the opposite 'end is a recess 51, receiving a die 27, -that is pressed outward by a compression-spring 28,

the construction of this portion of the v'device being practically the same as that lshown in Fig. 1. The second pole-piece 53 is recessed at 54 to receive a rivet-head vanda't the opposite end is recessed to receive' a movable die 27', which may be adjusted by means of a slidable wedge 30', the latter being moved in anyV desired manner.I

The cross-'bar is recessed to receive,

While the die 8o IOO ,los

Figs. 8, 9, and 1() illustrate a further modi- A tication ofthe invention. In this case the magnet 50 is provided with an annular recess to receive thecoil 16. On the outer face of the magnet-isa pair of pivot-ears 52, carrying a pin or cross-bar 53, on which is mounted a handled cam 54, and between the ears is guided an arm 55. vOn top of the magnet is a cireumferentially-adjustable washer 56, ta-

'peredin thickness from-one side to the other,

and by adjusting thiswasher the arm may be disposed at a right angle to the axes of the magnet-that is, parallel with the work-br at any desired angle thereto. Thee-outer end of the arm 55 `is upset to'form .a boss 57, which has a recess'. In the 'recess is a disk 59," that is thrust outward by a helical compresdies are readily interchangeable and that they sion-spring 60.. The outer face ofthe disk is dished orcupped for the reception of the correspondingly-shaped end of a'. die 2 7 1f, so'that the latter may i properly' receive the rivethead without rgardto\the angle of the .arm 55. The opposite sides of the recessed boss are provided withslots 61, in. which plays a pin 62, passing through the shank of the die -in order to prevent displacement of thelatter.

Fig. ll illustrates afurther modification in which a bar-magnet carries a die 27i at each end, the'- current being passed through the coil in either direction in accordance with which end of the device 1s in. use. One end ofthe bar is inclined, as shown, in order to 1 gain access to rivets in corners and other places.

In using any of the devices Ia switching mechanism oi any desired type is placed 'in the circuit in a position convenient to the.

workmamand in all cases where spring-pressed 4'dies are employed it is advisable to have the magnet :strong enough to overcome the resistanceof the spring.

or spring-or by- ;Patent, is-

1. In an electromagnetic rivet-holder ,a die of diamagneticfor approximately diamagnetic- .during theix heading process. The shank and die are retracted by a spring 63'when the pressure is'reduced.

In all cases it is to be understood that the f are so arranged as to follow up the rivet during the heading'process, the power employed being either mechanicalz', e. a wedge, screw,4

attraction.' y lHaving thus described my invention, what I claim as new,'a nd desire to securefby Letters material, a die-holder, an electromagnet,i-and means for permitting relative movement-'of4 the parts.v 5

holder, and a yieldable die carriedA thereby,

fluid pressure or magnetic 2. In combination, .an electromagnetie said die being formed of 'diamagnet'ic or =ap proximately diamagnetic material. 5 .y 3. In combination, holder having`,a die-receiving recess, and. a springpressedidioarranged inthe recess, the vdie being-formed of diamagnetic on pproxi-4 mately diamagnetic material.' ffl; l

an electromagneti f1.' In combination, a casing, a die-shank,.a

magnet-winding between the shank and casing, a die supported by the shank and concentric with the casing and winding, and means for forcing the die in the direction of the work.

In testimony whereof I afiix my signature in v presence of two witnesses.

. HENDERSON B'. DOUGLAS. l/Vitne'sses: JAMlss 0. CAMPBELL, T. C.. CAMPBELL. 

